The thermite process can be used to weld lengths of railway track together. A mould placed over the ends of the rails to be joined is filled with a charge of aluminium powder and iron(iii) oxide. When the mixture is ignited, a redox reaction occurs to form molten iron, which joins the rails together. a. Write a half equation for the conversion of iron(iii) oxide to metallic iron. i got Fe2O3 + 6H+ +6e- = 2Fe + 3H20- but thats wrong according to the book, the answer is Fe2O3(s) + 6e- --> 2Fe(l) + 3O 2- (s). I don't understand why they balanced it using oxygen instead of water. b. Write the overall equation for the thermite process.